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【单选题】
例 3 某质点的运动方程为 x = 2 t - 7 t 3 + 3 ( SI ) ,则该质点作
A.
(A) 匀加速直线运动，加速度沿 x 轴正方向
B.
(B) 匀加速直线运动，加速度沿 x 轴负方向
C.
(C) 变加速直线运动，加速度沿 x 轴正方向
D.
(D) 变加速直线运动，加速度沿 x 轴负方向
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